The invention regards a surgical instrument for use in minimal invasive surgery wherein a surgeon performs a surgical procedure within a body cavity with indirect vision of a surgical field, the surgical instrument comprises, a handle portion for manipulation of the instrument, and a body portion extending from the handle portion and comprising a surgical tool, wherein the body portion is adapted to be inserted through an incision in a body into the body cavity, characterised in that the body portion further comprises a pattern generating member which, when the body part is inserted into the body cavity, projects a light pattern on an area of the surgical field such that the contours of the surgical field and the position of the instrument can be deduced by the surgeon based on indirect vision of the light pattern.
